diff --git a/README.md b/README.md
index 322c0fe..6bd4bfc 100644
--- a/README.md
+++ b/README.md
@@ -33,8 +33,8 @@ This is currently based on Packet Tracer 8.1.1 and is intended to track the late
 
     ```bash
     flatpak install \
-        org.freedesktop.Platform/x86_64/20.08 \
-        org.freedesktop.Sdk/x86_64/20.08
+        org.freedesktop.Platform/x86_64/21.08 \
+        org.freedesktop.Sdk/x86_64/21.08
     ```
 
 4. Download the official Deb package to the cloned repository (don't rename it).
diff --git a/com.cisco.PacketTracer.yml b/com.cisco.PacketTracer.yml
index f70f645..b580f46 100644
--- a/com.cisco.PacketTracer.yml
+++ b/com.cisco.PacketTracer.yml
@@ -1,6 +1,6 @@
 app-id: com.cisco.PacketTracer
 runtime: org.freedesktop.Platform
-runtime-version: '20.08'
+runtime-version: '21.08'
 sdk: org.freedesktop.Sdk
 command: /app/pt/packettracer
 finish-args: